Sewing machine



mm; mm H. IDUKE M 96 SEWING MACHINE Filed Cat. 31, 1934 8 Sheets-She et 1 Fig.1.

Invanior I Harry Duke.

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SEWING MACHINE Filed- 001;. 51, 1954. 8 Sheets-Sheet 4 Fig. 4-

Harry DUKQ March 1% 19336 H, D v fi fi SEWING MACHINE Filed 001;. 51, 1934 8 Sheets-Shet 5 SEWING MACHINE FilGd not. 31, 1934 8 Sheets-Sheet 6 AYE 5.

Mamfin m @366 H. DUKE SEWING MACHINE Filed Oct. 61, 1934 8 Sheets-Sheet T ihvanio'r.

arr fDKe Patented Mar. 10, 1936 SEWING MACHINE Harry Duke, Salem, Mass. Application October 31, 1934, Serial No. 750,852

8 Claims.

This invention relates to overedge sewing machines of the type having a needle for carrying a loop of needle thread through the work and two loopers cooperating with the needle to form the overedge stitches, one looper operating beneath the work and the other having a loop-carrying movement around the edge of the work. I have shown herein two forms of the invention in one of which the looper operating beneath the work is a threaded looper, and in the other of which both loopers are nonthreaded loopers.

The object of the invention is to provide various improvements in overedge sewing machines of the type above referred to, which improvements will be more fully hereinafter set forth and then pointed out in the appended claims.

In the drawings wherein 1 have illustrated a selected embodiment of the invention Fig. 1 is a side view of a sewing machine embodying the invention with the cover plate 61 and the plate it having the guide-eye I69 shown in dotted lines.

Fig. 2 is a view of the sewing machine looking from the left in Fig. 1.

Fig. 3 is a section on the line 33 Fig. 1.

Fig. 4 is a section on substantially the line 4-4 Fig. 1.

Figs. 5, 6 and '7 are diagrammatical views showing the manner in which the stitch-forming mechanism operates.

Fig. 8 is a fragmentary view illustrating a different embodiment of the invention.

Fig. 9 is a sectional view through the multiple eccentric element that controls the operation of the needle and the two loopers.

Fig. 10 is a fragmentary perspective view illustrating the means for operating the threaded looper.

Fig. 11 is a fragmentary view illustrating the means for operating the non-threaded looper.

Fig. 12 is a fragmentary view illustrating the take-up device for the looper thread.

Figs. 13 and 14 are fragmentary views showing the embodiment of the invention in which both loopers are non-threaded loopers, Fig. 13 showing the operation of taking the loop: of needle thread from the needle and Fig. 14 showing the operation of carrying said loop around the edge of the work.

Fig. 15 is a fragmentary perspective view illustrating the looper H6.

The sewing machine herein illustrated is provided with the main frame I which is formed with the work-supporting portion 2 on which the work 112 is supported as it is being sewed and the overhanging arm 3 which carries the needle 4. The needle is secured to a needle bar 5 which reciprocates in a generally vertical direction and is guided in its reciprocation by a bearing 6 carried by the head l2 at the end of the arm 3.

indicates a presser foot for holding the work to the work-supporting surface 2 during the sewing operation, said presser foot being carried by a presser foot bar 8 which is guided for vertical movement in bearings in the head 12, and which is held yieldingly against the work by a suitable spring 9 which bears at one end against a foot It! extending from the presser foot bar 3, and at the other end bears against a spring seat ll carried by the head 12. The presser foot 1 is raised from the work w by means of a lever I I9 pivoted tothe upper end of the presser foot bar 8 and face I26 adapted to engage the upper edge of the head l2 as the lever tical position.

The needle bar receives tion from an eccentric [3 provided with a cam is swung into a verits vertical reciprocawhich is mounted on the drive shaft It, the latter being journalled in the frame and actuated from a driving pulley !5 which may be clutched to the shaft or unclutched therefrom by any suitable mechanism.

The eccentric l3 operates [6 which is connected by to an arm 18 of a rocker pivotally arm 3. This rocker l9 rigid therewith in an eccentric strap a connecting arm I! member H] which is -mounted on a stud 20 carried by the has another arm 2! which extends forwardly and which is connected through a suitable link 22 to a collar 23 that is fast on the needle bar. The

eccentric arm [1 is shown as connected to the rocker arm I8 through a ball and socket joint 24, which allows freedom of motion without binding the parts, notwithstanding the fact that the rocker arm 18 is moving in the arc of a circle of which the shaft or stud 20 is the center.

The needle 4 carries the needle thread n, said eye 28 carried by an arm the needle-actuating arm 2|,

29 that is secured to and from the guide-eye 28 the thread passes to the eye of the needle. The arm 21 serves not only to give the needle its vertical reciprocation, but also acts as a take-up arm as will be presently described.

The looper which opera tes beneath the work is indicated at in Figs. 1 to 11 and it is a threaded looper. This threaded looper takes the loops of needle thread from the needle, which loops will for convenience be hereinafter referred to as needle loops, and passes through the needle loops loops of looper thread, which for convenience will be referred to as looper loops. The non-threaded looper takes the looper loops and carries them around the edge of the work into position to receive the needle on its penetrating thrust. The looper thread carried by the threaded looper is indicated at l. The threaded looper 30 is provided with a stem 3! which is adjustably mounted in an arm 32 of a rocker member 33, said rocker member having a rocking motion about a stud shaft 34 that is mounted in the frame. This looper 30 vibrates in a horizontal direction and receives its vibration from an eccentric 35 mounted on the drive shaft l4. Said eccentric is received in an accentric strap 36 which has an arm 37 extending therefrom that is pivotally-connected with a ball and. socket joint 38 to an arm 39 of a rocker member 43 which is mounted for rocking or oscillating movement on a stud shaft 4| carried by the frame I. This rocker 40 has an upstanding arm 42 which is connected by a link 43 with an arm 44 rigid with the rocker 33. The eccentric strap 36 thus gives an oscillating rocking motion to the rocker 40 and the latter operates through the link 43 to oscillate the rocker 33, thereby giving the looper 30 its horizontal oscillating movement from the position shown in Fig. 5 to that shown in Fig. 6.

Each time that the needle 4 makes its penetrating thrust and starts on its backward journey, it throws out a needle loop a as is usual in sewing machines. and at this time the threaded looper 30 enters the needle loop shown at a and retains said loop during the backward thrust of the needle and introduces a loop b of looper thread I through the needle loop a. This loop b of looper thread will, for convenience, be referred to as the looper-loop. Cooperating with the threaded looper 30 is a second looper 45 which is a non-threaded looper and which takes the looper-loop b from the threaded looper 30 as shown in Fig. 6 and carries said looper-loop b around the edge of the work w and places it in position to receive the needle 4 upon its next penetrating thrust as shown in Fig. 7 as is usual in sewing machines of this type. The second or non-threaded looper 45 has the beak or point 46 which picks the loop b off from the looper 30 and it has also the barb or projection 4'! which retains the loop b in position on the end of the looper. This looper also is cut away at its back side as shown at 48 to provide space for the needle on its penetrating thrust, and it will be noted that the needle bar is set at a slight inclination as shown best in Figs. 2 and 3 so as to facilitate the entrance of the needle into the looper-loop b as said needle makes its penetrating thrust.

The non-threaded looper 45 receives its motion from an eccentric 49 also mounted on the shaft 14, said eccentric 49 having the eccentric strap 50 which is connected by a connection 5| to a rocker 52 that is mounted on a shaft 53 carried in the arm 3. This rocker 52 has a depending arm 54 which is pivotally-connected at 55 to a looper carrier 56 in which the looper 45 is mounted. The oscillating arm 54 gives the looper 45 its necessary movement in a horizontal direction, and the vertical component of the motion of said looper is derived from a cam slot 51 formed in a stationary cam 58 that is adjustably-secured to the frame I. The looper carrier 55 is provided with a laterally-extending follower 59 which operates in said slot 57, and said slot is properly shaped to give the looper carrier 56 the proper vertical motion to carry the looper 45 around the edge of the work from the position shown in Fig. 6 to that shown in Fig. 7, or from the full to the dotted line position in Fig. 11 during the forward swinging movement of the arm 54 into the position shown in Fig. l. The cam plate 53 is secured in position on the portion 60 of the frame I by suitable clamping screws 6| which operate through slots 52 in the cam plate, thereby providing for proper adjustment of this cam plate.

The connection between the eccentric arm 5| and the arm 53 of the rocker 52 is a ball and socket connection, this adopted because the arm 63 has a movement in the arc of a circle about the stud 53 as a center.

The looper thread I is taken from the source of supply through a guide-eye 64, thence through a tension 55 and thence through a guide-eye 55 carried by a cover plate 61 shown in dotted lines in Fig. 1 and thence through an eye 68 formed in a finger 69 carried by the arm 54 and projecting through a slot I54 in the cover plate 51, and thence through another guide-eye I69 formed on a plate 13 that is adjustably secured to the cover plate 61, thence through a guide-eye "H on the frame and through a guiding passage 12 at the front of the frame and thence to the threaded looper 33. as a means for giving the looper 45 the horizontal component of its motion, but it also acts as a take-up lever for the looper thread I. The plate 10 carrying the guide-eye 69 is, as stated above, adjustably secured to the cover plate 61, this being accomplished by providing said plate '58 with slots 13 which receives clamping screws 74 by which the plate 10 is retained in position.

The three eccentrics I3, 49 and 35, which control the motions of the needle and the two loopers, are made integral with each other, and thus constitute a multiple eccentric element as seen in Fig. 9. This multiple eccentric element which is formed from a single piece of metal and has three eccentric portions i3, 49 and 35 formed thereon, is provided with an axial opening through which the shaft l4 extends, said multiple eccentric element made fast to the shaft either by being keyed thereto or by means of a suitable set screws 15. An advantage of this construction is that the three eccentrics can never get out of adjustment relative to each other since they are all made from a single piece of metal. This is important because it insures that the timing of the loopers and the needle will always be correct and can never be disturbed. The operation of the stitch-forming iechanism will be apparent from the above and is quite clearly illustrated in Figs. 5, 6 and '7. The threaded looper 30 operates to take each needle loop a from the needle as it begins its retracting movement, and not only retains said loop but inserts through it a looper-loop b of the. looper thread I as shown in Fig. 6. When the threaded looper 30 has reached the forward limit of its movement, the non-threaded looper 45 operates to take the looper-loop b from the looper and carry it upwardly around the edge of the work to and place it in a position to construction being The arm 54 serves not only IE receive the needle 4 on its next penetrating thrust. Upon such upward movement of the needle bar the needle thread take-up 29 serves to tighten the needle loop, and upon'each backward movement of the arm 54 the looper thread take-up 99 operates to tighten the looper-loop. The use of the vertical cam plate 58 for controlling the non-threaded looper provides a very simple construction and one which is easily kept in adjustment.

The feed motion for feeding the work forward comprises a four motion feed dog I6 that is mounted on a carrier H which has both a vertical movement and a horizontal movement. This carrier TI is provided with the arm or stem I8 which is pivotally-connected at its rear end to a rocker i9 that has rocking movement about a pivot 39. The lower end of the rocker is pivot- -ally-connected at 9| to a link 82, one end 83 of which is in the form of an eccentric strap embracing an eccentric 84 formed on the drive shaft M. The eccentric 84 produces a rocking motion in the rocker i9 about its pivot 80, and such rocker motion gives a horizontal motion to the feed dog It. The vertical component of the motion of the feed dog is derived from an eccentrio pin 85 formed on the end of the shaft I4, said pin carrying a block 86 which is received in the forked end 31 of an arm 88 rigid with a sleeve or rocker 89 that is mounted for rocking movement on a stationary shaft 99. This rocker 59 has a' horizontally-extending arm which is forked at its end as shown at 92, said forked end receiving a block 93 that is mounted on a pin 9 secured to the carrier 11. The eccentric pin 85 gives a rocking motion to the rocker or sleeve 99, thereby causing a vertical swinging movement of the arm 9! which in turn gives the carrier l? and feed dog IS the vertical component of their motion.

Means are provided for adjusting the feed so as to produce longer or shorter stitches, and this is accomplished by shifting the position of the pivot 99 for the rocker I9. The eccentric 8 has a fixed throw and by adjusting the position of the pivot 80 in the rocker I9, the amplitude of horizontal movement given the stem 18 and carrier I9 can be varied. The pivotal stud 99 for the rocker I9 is carried in a boss formed on the arm 96 of an elbow lever 91 which is pivoted to the frame at 98. The vertical arm 99 of this lever is adjustably secured to a quadrant member I99 rigid with the frame I. In the construction shown in Fig. 2 this quadrant member has a slot IOI which receives a clamping bolt I92 that is carried by the upper end of the arm 99. By loosening the clamping bolt the elbow lever 91 can be turned about its pivot 98 so as to raise or lower the pivot BI! of the rocker 19 depending upon whether it is desired to shorten or lengthen the stitches. After the adjustment has been made, it can be retained by tightening the clamping bolt I02.

In Fig. 8 I have shown a slightly different construction for securing the adjustment of the length of the stitches. In this embodiment the elbow lever corresponding to the lever 91 in Fig. 2 is indicated at I93 and this lever is provided with a handle I94 by which it can be manipulated. The lever is retained in its adjusted position by means of a quadrant I95 which is provided with a slot I96 in which is received a clamping bolt it? carried by the vertical arm of the elbow lever. This device works in the. same manner as that shown in Fig. 2, but because of the provision of the handle IM the operation of making the adjustment is facilitated.

The machine herein shown is also provided with trimming means for trimming the edge of the work 10 as the stitching proceeds. trimming device comprises a cutting blade I99 which is provided with a cutting edge E39 and is adjustably secured to a carrier IE9 by means of a clamping bolt I I I, said carrier in turn being adjustably mounted in the frame. The cutting edge I99 of this cutting blade is substantially at the level of the work-supporting surface of the work support 2. Cooperating with this stationary cutting blade is a movable cutting blade II2, which is adjustably secured to a head H3 on the end of a rocker member IN that is pivotally mounted on a shaft H5 supported in suitable bearings carried by the frame. The other end of the rocker member is forked as shown at H5 and its forked end receives a block III mounted on an eccentric portion N3 of the shaft I4. The movable cutter H2 is thus given a vertical oscillating movement and thereby cooperates with the fixed cutter blade to trim the edge of the work.

I have stated above that the carrier III) on which the under cutter blade I99 is mounted is in turn mounted for horizontal adjustment in the frame. This carrier H9 rests on a supporting surface I23 on which it is horizontally adjustable, and it is held in its adjusted position by a clamping bolt I24 which serves to clamp it firmly against the vertical face I25.

In these Figs. l3, 14 there is illustrated an embodiment of the invention in which both loopers are nonthreaded loopers. The looper which operates beneath the work is shown at I29, and it is secured in the arm 32 of the rocker member 33 above referred to. This looper I29 is provided with the beak I27 adapted to engage the needle loop a as shown in Fig. 13 and to carry said looper forwardly into the dotted line position Fig. 13. This looper M6 is also provided with the needle guiding finger I28 against which the needle rests as the loop is being taken therefrom, and which properly positions the needle so that the beak I21 will invariably enter the needle loop a. The second looper of the embodiment shown in Figs 13 and 14 is indicated at 45, and has the same construction as the nonthreaded looper shown in Figs. 1 to 11. The looper 45 of Fig. 13 is mounted in a looper carrier 56 that is pivotally-connected at 55 to the depending oscillating arm 54 above referred to. The looper 45 has a movement from the full line position in Fig. 13 forwardly to the dotted line position in which it picks the needle loop a off from the looper I26, and thence into the upper forward position shown in Fig. 14 in which it presents the needle loop a in position to receive the needle 4 on its next penetrating thrust. The looper 45 is guided in its horizontal movement by the cam slot 57 formed in the cam plate 58 above referred to.

I claim:

1. An overedge sewing machine comprising a reciprocating needle, an oscillating threaded looper for taking loops of needle thread from the needle and passing therethrough loops of looper thread, a non-threaded looper for taking said loops of looper thread and presenting them to the needle, an oscillating arm connected to the non-threaded looper for moving it in a horizontal direction and a cam plate guiding said non-threaded looper during its horizontal movement and giving to it the vertical component of its motion.

2. An overedge sewing machine comprising a reciprocating needle, an oscillating threaded looper for taking loops of needle thread from the needle and passing therethrough loops of looper thread, a non-threaded looper for taking said loops of looper thread and presenting them to the needle, a carrier for the non-threaded looper, an oscillating arm to which the carrier is pivotally connected and by which it is given its horizontal movement and a cam plate guiding said carrier during its horizontal motion and giving it the vertical component of its motion.

3. An overedge sewing machine comprising a reciprocating needle, an oscillating threaded looper for taking loops of needle thread from the needle and passing therethrough loops of looper thread, a non-threaded looper for taking said loops of looper thread and presenting them to the needle, a carrier for the non-threaded looper, means for giving said carrier a horizontal movement, a cam plate having a cam slot and a follower carried by the carrier and operating in said slot, the latter giving the carrier the vertical component of motion.

4. An overedge sewing machine comprising a reciprocating needle operating above the work, an oscillating threaded looper beneath the work for taking loops of needle thread and passing therethrough loops of looper thread, a nonthreaded looper for taking the loops of looper thread and carrying them around the edge of the work and presenting them to the needle, a vibrating arm to which the non-threaded looper is pivotally-connected, a vertically-arranged cam plate having a cam slot and a follower associated with the non-threaded looper and operating in said slot, the latter giving the non-threaded looper its vertical component of motion.

5. An overedge sewing machine comprising a vertical reciprocating needle, an oscillating threaded looper for taking loops of needle thread and passing therethrough loops of looper thread, a non-threaded looper for taking the loops of looper thread and presenting them to the needle, a one-piece triple eccentric member having three eccentric portions, connections from one eccentric portion for reciprocating the needle, connections from another eccentric portion for operating the threaded looper and connections from the remaining eccentric portion for operating the nonthreaded looper.

6. An overedge sewing machine comprising a reciprocating needle, an oscillating threaded looper for taking loops of needle thread from the needle and passing therethrough loops of looper thread, a non-threaded looper for taking said loops of looper thread and presenting them to the needle, an oscillating arm for actuating the non-threaded looper, a cam plate for guiding the non-threaded looper in its movement and guideeyes through which the looper thread passes, one of said guide-eyes being carried by the oscillating arm whereby the latter operates both to actuate the non-threaded looper and as a take-up arm for the looper thread.

7. An overedge sewing machine comprising a reciprocating needle, an oscillating looper operating beneath the work for taking loops of needle thread from the needle, a second looper cooperating with the first-named looper and the needle to form overedge stitches, an oscillating arm for giving said second looper movement in a horizontal direction, a vertically-arranged cam plate having a cam slot for guiding said second looper in its horizontal movement and giving it a vertical movement to carry it around the edge of the work.

8. An overedge sewing machine comprising a reciprocating needle, an oscillating looper beneath the work, a second looper, a carrier therefor, an oscillating arm to which said carrier is pivotally-mounted and by which it is given its horizontal movement, and a vertically-arranged cam plate having a cam slot for guiding the looper carrier during its horizontal movement and giving to it a vertical movement which carries it around the edge of the work.

HARRY DUKE. 

